Checker Shadow Visual Optical Illusion Reloaded

Today, we found something that’s really cool to see! It’s a video of the already classic “Checker Shadow Illusion” by Edward H. Adelson, Professor of Vision Science at MIT that was first presented to the audience in 1995! If by now there were several drawings explaining how the illusion works, but, as they say that a picture’s worth a thousand words, a video must be worth a trillion!

What to see?

Well, since we’re talking about the already classic visual optical illusion, there’s nothing much to say here, is it? Simply notice how the white square in the shadow is actually the same color as the gray square that’s not in the shadow. You didn’t notice? Well, don’t worry, we have the video to prove it! Which, to be completely honest, makes it an even more spectacular optical phenomenon!

How it works?

The initial concept is a 3D image, and we know that when we’re talking about 3D images, our brain tends to play tricks on us.  And why? Well, simply because our brains are trying to interpret a 3D scene by estimating the light vectors and using them to estimate the properties of the material. However, analyzing the amount of light on a surface is not enough simply because our brains work in mysterious ways to compensate for shadows.

We already covered this illusion a couple of months ago, so if you want to read more about it and how it works, then click on this link!

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